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Wilo -Atmos BST Instrucciones De Instalación Y Funcionamiento página 53

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12
Spare parts
12.1
Recommended stocking of spare
parts for two-year continuous op-
eration
Installation and operating instructions • Wilo-Atmos BST • Ed.01/2023-07
Faults
Causes
Pump runs but provides
no water
Pump runs backwards
when switched off
Mechanical seal is defective
Mechanical seal leakage
Noise
Table 7: Mechanical faults
Obtain original spare parts only from a qualified specialist or Wilo customer service. To
avoid queries and order errors, please provide all pump and drive rating plate data with
every order.
It is recommended that maintenance and repair work on the pump is only carried out by
Wilo or authorised specialists!
CAUTION
Risk of material damage!
Trouble-free pump operation can only be guaranteed when original
spare parts are used.
Use only original Wilo spare parts!
Information to be provided when ordering spare parts: Spare part num-
bers, spare part designations, all data from pump and drive rating plate.
This helps prevent return queries and incorrect orders.
Specify the number of spare parts required!
Part no.
Designation
4
Impeller
-
Ball bearing
6/3
Mechanical seal
2/8
Flat gasket/O-ring
(set)
Remedy
Suction pipe/pump
clogged by impurities
Foot or non-return valve
blocked in closed position
Leakage in suction pipe
Air in suction pipe or
pump
Incorrect direction of ro-
tation of the motor
Leakage in suction pipe
Foot or non-return valve
is defective
Replace mechanical seal (contact
service)
Cavitation occurs in the
pump
Pump does not rotate
freely (friction resistance)
because of the incorrect
pump shaft position
Ratio of system pressure
to pump pressure is too
low
Frequency converter not
running
Number of pumps (including standby pumps)
2
3
4
5
Number of spare parts
1
1
1
2
2
2
4
4
2
2
4
4
4
6
8
8
en
Clean pump and suction pipe
Repair the foot or non-return
valve
Repair the suction pipe
Check the suction conditions,
vent the system
Change motor wiring (3 phase
motor: swap phases)
Remove leakage
Repair the foot or non-return
valve
Check the suction conditions
Realign pump shaft
Improve system or choose a
suitable pump
Check the frequency con-
verter operation
6 and 7 8 and 9 10 and
more
2
3
30%
6
8
100%
6
8
100%
9
12
150%
53

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Atmos bst-p7